Tail-foot for lathes.



B. D. JACKSON.

TAIL FOOT FUR LATHES.

APPLIUATION FILED Nov. 7, 1912.

Patented Nov. 18, 1913.A

.rra sfraarEsQ PATENT pnxisoE., i i

BYRON D. JACKSON, OE ERIE, rENNsXLvANin, AssicfNon ro va'igoiDEaN Toor.COMPANY,

OF ERIE, i3ENNsrnvaNiA,A conrona'sioN OE PENNsrLvaNIA.

'ILAIIz-FOOT FOR LATE-ES.

Specification of Letters `.Fe/tent.

Paten-tediN-ov. 18., 19113 To all whom t may concern Be it known that I,BYRON D. JACKSON,

a citizen of the United States, residing atV Y the claims.

In forming a tail-foot for grinding niachines and similar articles it isnecessary to hold the spindle carrying the cent-er with great rigidityso that great accuracy may he had in the performance of the machine.

The object of the present invention is to improve a tail-foot in thisparticular. Y

The invention is illustrated in the accompanying drawings as followsFigure l shows a plan view of a tail-foot. Fig. 2 is an end View partlyinseotion on the line 2 2 in Fig. 1.

l marks the lathe center, 2 the work carried by the center, and 3 thespindle carrying the center. The spindle is carried in a bearing 4arranged in the tail-foot block 4, The bearing 4 is split longitudinallyfor a distance back from the end of the bearing spindle, this separationbeing indicated at 6. In Order to give the part of the bearing thusseparated a uniform gripping surface throughout a suiiicient length toassure the alinement of the spindle, the hearing is cut `transversely at7 so that the forwardpart of the bearing will he free to spring theclamp and spindle. Lugs 8 extend upwardly from the hearing 4 along thelines of separation 6. These lugs form a dove-tail and have the wedgesurfaces 9, the wedge eX- tending in a longitudinal direction. Aclamping plate 10 extends over the lugs 8 and has the downwardlyextending lips 10a, the inner surfaces of Which correspond to thesurfaces 9 of the lug 8. A lever 1l is pivotally mounted on the bearing4 by a pin 12 and is connectedwith the plate 10 by means of the pin 18.

The spindle is moved loy any desired mechanism, the,` hand wheel 5 beingarranged for this purpose, and when the center is properly adjusted' intheV work the lever 11 is operated forcing the plate 10 forward. Thewedge surfaces on the inner edge o-f the lips l0a engaging the wedgesurfaces 9 force the free side of the bearing 4 into engagement with thespindle, thus securely clamping the spindle in accurate alincinent withthe surfaceV of the hearing. The frictional engagement with the wedgesurfaces is suflicient to hold the clamping plate in position during theoperation on the work. At the completion of the operation the lever 11is swung to free the plate and the center can then be withdrawn by theoperation of the hand wheel on the spindle in the usual manner.

What I claim as new is l. In a tail-foot for lathes, the coinbinaf tionof a spindle; a spindle carrying hearing split longitudinally and havinglugs alo-iig the line of separation, said lugs form# ing alongitudinally extending wedge; a clamp plate arranged over the lugshaving wedge surfaces engaging the wedge surfaces on the lugs; means forforcing the clamp plate longitudinally; and means for moving A thespindle longitudinally.

2. In a tail-foot for lathes, the combination of a spindle; a spindlecarrying bearaoKV ing split longitudinally and having dovetail lugsalong the line of separation, `said dove-tail lugs forming alongitudinally eX- tending wedge; a clamp plate arranged over the lugshaving wedge surfaces engaging the wedge surfaces on the lugs; means forforcing the clamp plate longitudinally; and means forV moving thespindle longitudinally;

3. In a tail-foot for lathes, the co1nbination of a spindle; a spindlecarrying bearing split longitudinally and having lugs along the line ofseparation; said lugs forining a longitudinally extending wedge; a clampplate arranged over the lugs having wedge surfaces engaging the wedgesurfaces on the lugs; and a lever pivotally mounted on the spindlecarrying bearing for operating the clamp plate.

4. In a tail-foot for lathes, the combination of a spindle; a spindlecarrying beary ing split longitudinally through a part of its surfaceand having a transverse slot ex tending from the longitudinalseparation, said bearing being provided with lugs extending along theline of separation, said lugs forming a longitudinally extending my handin the presence of two subscribing Wedge; a clamp plate arranged overthe lugs Witnesses.

having Wedge surfaces envaofino the Wedge surfaces on the lugs; meartisZ:forbo-rcing the BYRON D JACKSON' 5 clamp platelongitudinally; andmeans for Witnesses:

moving the spindle longitudinally. B. M. HARTMAN,

In testimony whereof I have hereunto set H. C. LORD.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

